I would argue it makes the most sense to date all legal documents in UTC and using any other timezone would be a confusing mistake. But we can disagree.
For America, maybe EST sure, but UTC would not make any sense. Most people do not have an intuitive understanding of what their time zone to UTC is. However, picking a single well defined timezone would still fit your intent.
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This isn't really an issue that the vast majority of people face. Sure, it's a hard problem, but only a tiny number of people are affected by it.
I would argue it makes the most sense to date all legal documents in UTC and using any other timezone would be a confusing mistake. But we can disagree.
For America, maybe EST sure, but UTC would not make any sense. Most people do not have an intuitive understanding of what their time zone to UTC is. However, picking a single well defined timezone would still fit your intent.